The universe is everything—all of space, time, matter, and energy. Scientifically it is believed that it began with the Big Bang, an explosive event approximately 13.8 billion years ago that set space and matter in motion, leading to the creation of galaxies, stars, planets, and all the structures we see today.
How exactly did the universe come into being?
Our understanding of the universe comes from observing distant light, which allows us to see into the past, and through the development of powerful tools like the Hubble Space Telescope and James Webb Space Telescope. If we want to understand the universe, we have to understand it from all three perspectives ie. scientific, philosophical, and spiritual perspective.
1. Scientific Perspective
All-encompassing existence:
The universe is not just planets and stars, but all of existence, including fundamental particles, physical laws, and time itself.
Universe is a container.
1. Universe contains everything, it contains all space, time, energy, matter including all the stars, planets, galaxies, superclusters etc. Ancient science has all the detailed description of the development of the universe.
Is the universe just space?
Modern science has not been able to tell clearly the definition of the universe, but it tells that the universe is all of space and time and their contents, such as the sun, moon, earth, stars etc. planets, galaxies, and all other forms of matter and energy.
Is the universe just space that contains everything? Ancient science tells us that the universe is not just space.
Size of the Universe.
The size of the physical universe is infinite, all the dimensions of the universe are infinite. It is not possible to ascertain its actual size. But if we talk about the observable universe, then modern science tells us that ‘size of the observable universe is approximately 93 billion.‘
Theory of the universe.
There are many theories of the universe, out of which the most famous theory is the Big Bang Theory. The details of ‘how the universe developed’ is given in the Big Bang theory. The Big Bang theory tells us that the universe is space.

2. Philosophical Perspective
Definition of the universe.
That in which everything exists is called the universe. The universe is also known as Cosmos. All existing matter and space considered as a whole; the cosmos. There are many definitions of the universe. It is not possible to understand the whole universe by any one single definition.
Universe simply means, that which contains every thing. The universe is the vast empty space that holds everything from the tiny particle to galaxy.
Philosophical definition: Universe means that which has motion or harmony. In other words that which has one verse, rhythm or harmony.
According to the modern physics, the universe is all of space and time and their contents, including planets, sun, moon, stars, galaxies, and all other forms of matter and energy. But what exactly is the universe? It is still being understood. Why there is a universe, what is the purpose of the universe, it has not been fully understood so far.
Detailed theory of universe.
The universe is a cosmic egg, in which everything is there, there is space in it, there are innumerable planets like sun, moon, earth, all kinds of matter and energy.
Is Universe the space?
Universe is not only the space which contains everything but it is more than that. Universe is a system of supreme intelligence.
Are we in a Universe or galaxy?
First we are in the universe, after that it can be said that we are in the galaxy. Because the galaxy is inside the universe.
The 3 types of universe.
What are the 3 types of Universe?
There are basically three type of universe or cosmos; gross cosmos, subtle cosmos, causal cosmos.
3. Spiritual Perspective
Is everything in the universe? or is there some substance or matter outside the universe as well?
Universe contains eveything